When evaluating a basket mill, you must prioritize the grinding efficiency and cooling system. Key specs include the motor power (kW), which should align with your material viscosity, and the basket volume. Ensure the equipment features a double-walled cooling jacket for the grinding basket and the vessel to prevent thermal degradation of heat-sensitive materials. Additionally, check the impeller speed range (RPM) and the compatibility of the grinding media (zirconium beads) size with the basket mesh to ensure optimal particle size reduction.